[style] mass reformat all the non external code to 4 space indents

Ran everything through scripts/codestyle.space, which uses astyle
to generally follow K&R style.

Biggest non whitespace change is pulling brackets down on function
declarations, which I'm pretty ambivalent about, but astyle insists
on taking a stance

app/shell/shell.c

@@ -26,16 +26,16 @@
 
 static void shell_init(const struct app_descriptor *app)
 {
-	console_init();
+    console_init();
 }
 
 static void shell_entry(const struct app_descriptor *app, void *args)
 {
-	console_start();
+    console_start();
 }
 
 APP_START(shell)
-	.init = shell_init,
-	.entry = shell_entry,
-APP_END
+.init = shell_init,
+ .entry = shell_entry,
+  APP_END